Use this card in conjunction with Barcgal, which can fill up your soul easily.
This tip isn't easily applied completely anymore. Barcgal has been banned as a starting Vanguard.
Despite Barcgal's restriction as first Vanguard, its still easy gathering 5 souls for this card. Methods include:
The Galahad chain makes 5 souls inmediately if succesful.
Let your First Vanguard in the soul and riding normally to Grade 3 (You can also use Kuraudia or Wingal Brave and move them back) (3), using Pongal's skill to search Soul Savior Dragon (4), and riding SSD your next turn (5).